Suburban steam

paulhitch · 3 mei 2017

pmh_74 zei: ↑

I always understood it was so that the door could be opened in a tunnel to facilitate evacuation in an emergency - something the Underground still thinks about today, specifying front doors in all cabs for the same reason.
Also, the broad gauge section was Paddington (Suburban) to Farringdon, most of this is cut & cover (i.e. two walls with a roof on top) with relatively few arched overbridges. Whereas north of Baker Street there are long tunnels in the more traditional shape. I would have thought the curved tops to the doors were more relevant there, in which case the broad gauge reference is largely (although not entirely) erroneous. The Metropolitan did persist with a generous loading gauge though - which is why the recently replaced 'A' stock trains were about the only trains around in which 3+2 seating was reasonably comfortable. I believe they were the widest trains in the UK. (They were delivered new over the Great Central, another line with a generously wide loading gauge.)
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The "door flying open" thesis is not one dreamed up by me. Neither of us can say for certain which theory is right. What is certain is that hardly any, if any, other lines had this feature and many ran through tunnels.

PH

Thompson1706 · 3 mei 2017

Mersey Railway loco hauled coaches had round-topped doors.

Bob.

pmh_74 · 4 mei 2017

35B zei: ↑

Is that an Underground thing? I thought the ability to evacuate in tunnels was a mandatory feature of most new trains operating in tunnels
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You've just used 'mandatory' and 'most' in the same sentence. Does not compute!
The short answer is I am not sure, it may depend on the safety case of the particular operator. Eurotunnel for example doesn't insist on end doors in its trains (just as well really or they would look quite different), but you can somehow evacuate to the side and into a service tunnel. New Thameslink class 700s certainly don't have end doors but presumably you could evacuate onto the adjacent line once traffic was stopped. Maybe the specific problem is single bore tunnels. But I am guessing.

35B · 4 mei 2017

pmh_74 zei: ↑

You've just used 'mandatory' and 'most' in the same sentence. Does not compute!
The short answer is I am not sure, it may depend on the safety case of the particular operator. Eurotunnel for example doesn't insist on end doors in its trains (just as well really or they would look quite different), but you can somehow evacuate to the side and into a service tunnel. New Thameslink class 700s certainly don't have end doors but presumably you could evacuate onto the adjacent line once traffic was stopped. Maybe the specific problem is single bore tunnels. But I am guessing.
Click to expand...

Sorry for the confusion, I was thinking about the fact that there are inconsistencies but that the mandatory requirements apply away from LUL.

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